NASA: Liquid Water May Flow on Mars Listen Download Embed Share Share this on Facebook (Opens in a new window) Share this on Twitter (Opens in a new window) Share this via Email A hi-res image from the Mars Reconnassance Orbiter, showing the flow patterns that appear in Spring and Summer. ( CREDIT: NASA/JPL-Caltech/Univ. of Arizona ) Produced by Posey Gruener Produced by PRI and WNYC